Purification of graphene oxide dispersions by using a fluidic cell

Autor(es)

Santos, Marcos Alves ^[1] ; Marques, Lucas ^[1] ; Castro Silva, Cecilia de Carvalho ^[1]

Afiliação do(s) autor(es)

^[1] Univ Prebiteriana Mackenzie, MackGraphe Graphene & Nanomat Res Ctr, BR-01302907 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ANALYTICAL METHODS; v. 12, n. 28, p. 3575-3581, JUL 28 2020.
• Citações Web of Science: 0

Resumo

The purification process of graphene oxide (GO) is a key stage in the production of this two-dimensional material by the Hummers method. This step demands a large amount of water, energy and time. The inefficient removal of the contaminants present in GO may affect its properties and make it unfeasible for some applications, such as in the field of biology. Here, we develop a simple and efficient method for the purification of an aqueous GO dispersion based on a fluidic diffusion cell system with a porous nitrocellulose membrane. The effectiveness of the fluidic diffusion cell system was compared with that of traditional purification methods, such as dialysis and centrifugation. The proposed strategy achieves the best performance in the removal of the major contaminants (K((aq center dot))(+), Na((aq center dot))(+), Cl((aq center dot))(-), SO4(aq center dot)2-, Mn-(aq center dot)(2+) and MnO2(s)), demanding similar to 95% less water than dialysis and in a shorter time (similar to 23 h). The system operates under flow conditions, with minimum handling by the operator and is able to select the GO flakes with bigger lateral dimensions. This work represents a simple and fast alternative for purification of GO dispersions that can be easily scaled-up. (AU)

• Processo FAPESP: 17/15143-2 - Combinação de papel e nanomateriais no desenvolvimento de eletrodos de ânodo e cátodo para baterias do tipo íon-lítio
• Beneficiário: Lucas Marques
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 12/50259-8 - Grafeno: fotônica e opto-eletrônica: colaboração UPM-NUS
• Beneficiário: Antonio Helio de Castro Neto
• Modalidade de apoio: Auxílio à Pesquisa - Programa SPEC